Hi,
On Mon, 18 Jul 2005, Jan Engelhardt wrote:
> a simple question, though I could not clearly read it from the TCP RFC...
> do RST packets always have ACK set?
No, see RFC793 page 64:
SEGMENT ARRIVES
...
If the state is LISTEN then
first check for an RST
An incoming RST should be ignored. Return.
second check for an ACK
Any acknowledgment is bad if it arrives on a connection still in
the LISTEN state. An acceptable reset segment should be formed
for any arriving ACK-bearing segment. The RST should be
formatted as follows:
<SEQ=SEG.ACK><CTL=RST>
Best regards,
Jozsef
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